Aeroplane supporting surface



Feb. 24, 1931. J Ks 1,-793,702

AEROPLANE SUPPORTING SURFACE Filed Jan. 6, 1950 Patent Feb. 24, 1931 PATENI OFFICE J'OSEIPE KSOLL, Oli IBRESLA'J', GERMAN'Y AEROIPLAN'E SUPPORTIIN'G SURFACE Application filed Ianuary 6, 1930, Serial No.

Patent application Serial No. 337,422 dated February 4, 1929, describes an aeroplane carrying surface with transversely directed nozzle-shapecl gaps extending inclined towards the rear from the underside towards the upper side and unite above the head of the real supporting surface in a common outlet gap. This supporting surface is remarkable for the fact that with a small angle of adjustment the values (if the raising force and resistance are approximately similar to the corresponding values of an ordinary supporting surface.

This invention relates to an arrangement,

enabling the closing of the gaps, in order to transfonn the supporting surface into an ordinary plane, ami it consists in that a device similar to a Venetan-blind covering the inlet opening of the nozzle-shapecl gap and '211- rfin ed on the under side of the supporting sur ace is used for closing each of the nozzlesha ped gaps.

he employment of a single flap or single plane is known for closing the opening of a nozzle-shaped jgap, the dimensione of such flaps corresponding in'the longitudinal direction of the supporting surface With those of the gap inlet. These known closing devices are however, if they move within the section of the supporting plane, difiicult te operate by band, as the pressure, acting on the flap or surfaee which h as to be overcome ,When m-oving the flap into the closin g position, is

very great, whereas, if the fiap or plane lies in the open position entirely or partly outside the ordlnary plane section, the air flow on the lower sicle of the aeroplane supporting surfaee and therefore the efi'ect of the nozzleshaped gap is considerably affected.

Consequently, according to the invention, a

Venetian blind surface is provided, instead of the usual single flap on plane, and composed of a plurality of small flaps or planes, movable within the ordinary plana section.

, An embodiment of the invention s illustrated by way of example in the only figure of the accompanying drawing in which:

a, I) ami e are the parts of the supporting surface, separated by nozzle-shaped gaps cl 50 ami 6, the pari: a, known as the flap, being 418,831, and in- Germany Janua ry 7, 1929.

flap c by means of a link la so that, al: horizontal flight (travelling flight) the gap mouth 71 is more 01 less closed and on lowering the flap the gap mouth is widened.

On the under side of the aroplane sup porting surface Venetian blind surfaces l are provided as gap closures, by means of which the ends of the nozzle-shaped gaps al end e.

can be covered. These Venetian blind surfaces are preferably connected with the flap c by a lever mechanism, net shown, so that on the lowering of the flap the Venetian blind surfaces suddenly open, thereby very considerably increasng the lifting force and that they again close when the flap is being moved into the horizontal position, whereby the lifting force is reduced again to that of an ordinary supporting surface. The Venetian blind surfaces also present the advantage, that the air ecldy current occurring on the lower side of the supporting surface cannot enter as a whole into the nozzle-shaped "gaps, but is divided into sub-eddies and thereby weakened.

I claim:

- A11 aeroplane supporting surface, comprising in c ombination a real flap, a main suppprting surface having transverse nozzleshapecl gaps leadng to in front of and behind the centre of the supporting surface from the under side inclined towarcls the real to the upper sile and uniting above the head of the rear flap in a common further narrowed outlet gap, and a Venetian blind sul fece composed of movable small flaps a1- ranged within the section of the supporting surface adapted to close the inlet ends of said gaps.

In testimony whereof I aflix my signature.

J OSEPH KSOLL. 

